<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .father {
      border: 1px solid red;
    }

    .container {
      width: 50px;
      height: 50px;
      margin-top: 50px;
    }

  </style>
</head>

<body>
  <div class="father">
    <div class="container"></div>
  </div>
</body>

</html>
